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14 August, 07:18

A sample of hydrogen gas has a volume of 8560. mL at standard temperature and a pressure

of 1.50 atm. Calculate the number of moles of H, present in this gas sample.

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  1. 14 August, 10:36
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    Answer: 5.26 moles

    Explanation:

    Given that:

    Volume of hydrogen gas V = 8560mL

    (since 1000 mL = 1dm3

    8560mL = 8560/1000 = 8.56dm3)

    Standard temperature T = 25°C

    Convert temperature in Celsius to Kelvin

    (25°C + 273 = 298K)

    Pressure P = 1.5atm

    Number of moles of hydrogen = ?

    Note that Molar gas constant R is a constant with a value of 0.0082 ATM dm3 K-1 mol-1

    Then, apply ideal gas equation

    pV = nRT

    1.5 atm x 8.56dm3 = n x (0.0082 atm dm3 K-1 mol-1 x 298K)

    12.84atm dm3 = n x 2.44atm dm3 mol-1

    n = (12.84atm dm3 / 2.44atm dm3 mol-1)

    n = 5.26 moles

    Thus, there are 5.26 moles of Hydrogen, H present in this gas sample.
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